open https://gitlab.synchro.net/main/sbbs/-/issues/940

Take a look through https://kuehlbox.wtf/wiki/doku.php?id=customizing:display_file_conventions#pcboard_macros to see what's missing in Synchronet, if anything.

Add aliases for those that already exist, but under a different code (e.g. BYTERATIO as alias for UDR).
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* Origin: Vertrauen - [vert/cvs/bbs].synchro.net (1:103/705)

https://gitlab.synchro.net/main/sbbs/-/issues/940#note_8104

See also https://www.kuehlbox.wtf/wiki/customizing:display_file_conventions
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